Factors controlling the efficiency of rock phosphates for potatoes and rye on humic sandy soils

摘要: The results obtained in experiments and farming with rock phosphate applied to any given crop on acid humic sandy soils are very variable. These variations mainly due relatively small differences between the soils. For practical reasons it is important distinguish suitable unsuitable for efficient use of phosphates. It has generally been accepted that phosphates converted into 'soil phosphate' by a direct 'decomposing' action soil. However, Bu tkev ich x had claimed availability crops not primarily soil acidity breaking them down. several he considers medium which determines interaction plants rather than factor operating directly its decomposition. Thus, properties only so far as they determine capacity disintegrate phosphate. According this author idea depends entry phosphorus solution must be considered an oversimplification problem. This may hold conditions under problem studied Russia. But still possible degree content easily soluble increased application dominant regarding efficiency main grown